TY  - JOUR
AU  - A. G. Kuz'min
TI  - Boundary value problems for equations of mixed type with characteristics that cross the line of degeneracy twice.~I
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 1853
EP  - 1861
VL  - 11
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_10_a16/
LA  - ru
ID  - DE_1975_11_10_a16
ER  -